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would rather that somebody did…“宁愿……;更愿意……”(表示现在或将来的愿望)
would rather that somebody had done…“宁愿……;更愿意……”(表示过去的愿望)
i‘d rather you posted the letter right now. 我想让你现在去寄信。
i’d rather you were not a celebrated actor. in that case， we could spend more time together.
i‘d rather that i hadn’t seen her yesterday. 我情愿昨天没有看到她。
as if/though+主语+did/had done…好像……(表示现在或将来的情况用过去时;表示过去的情况用过去完成时)[参考2016高考英语必考知识点4]
our head teacher treats us as if we were her own children， so all the students in our class think highly of her.
alan talked about rome as if he had been there. alan谈起罗马来就好像他去过那里似的。
“wish +宾语从句”，表示不大 可能实现的愿望
how i wish we students had more free time to relax ourselves!我们学生多么希望有更多的自由时间放松自己!
i failed in the maths exam. how i wish i hadn‘t wasted so much time playing!
what a pity you can’t go to the party. how i wish i could dance with you at the party!
it‘s high/about time that somebody did (should do) (should通常不省略) …早就该……
it’s time that you went to school.= it‘s time that you should go to school.
it’s high time that we did something to improve our environment. 该是我们为环保做些事情了。
i think it‘s high time that she made up her mind. 我想她该拿定主意了。
could have done “本来可以……”(表示过去没有实现的可能)。
might have done “本来可能……;本来应该或可以做某事”(实际没有发生;含有轻微的责备语气。
should/ought to have done “本来该做某事”(而实际未做)
should not/ought not to have done “本来不该做”(实际却做过了，含有责备语气)
needn’t have done “本来不必做”(但是已经做过了)
would rather have done “当时宁愿做了某事”(实际没有做过);否定式would rather not have done表达相反意思，两者都有表示“后悔”之意。
as， though， although引导的让步状语从句。
1. although/though i‘m young， i already know what career i want to follow.
→young as/though i am， i already know what career i want to follow.
2. although/though i respect him very much， i cannot agree with his idea.
→much as/though i respect him， i cannot agree with his idea. 虽然我很尊重他，但是我不同意他的观点。
3. although/though he is a child， he knows a lot of chinese characters.
→child(省略冠词)as/though he is， he knows a lot of chinese characters. 他虽然还是个孩子，却认识了许多汉字。
4. although he tried， he couldn’t solve the problem.
→try as he might， he couldn‘t solve the problem. 尽管他努力了，但是他没有解决问题。
5. although it is raining， i’m going out for a walk.
→raining as it is， i‘m going out for a walk. 天虽然在下雨，我还是要出去散步。
6. strange as it may seem， nobody was injured in the accident. 这次意外虽然显得不可思议，却没有人受伤。
7. much as i would like to help， i have a lot to do. 虽然我很想帮助你，但是我有很多事要做。
8. object as you may， i will go. 纵使你反对，我也要去。
the roof fell before he had time to dash into the room to save his baby.
he ran off before i could stop him. 我还没有来得及阻止，他已经跑了。
to my great disappointment， my favorite singer left the concert before i could have a word with her.
they walked about fifty miles to the west before they saw a village.
the workers worked day and night about three days before everything returned to normal.
he almost knocked me down before he knew it.
we had walked a long way before we found some water.
five years went by before i knew it. 不知不觉，五年过去了。
it was + 时间段+before…。“过了多久才(怎么样)……”
it was not long before…。“不久，就……”
it will (not) be +时间段+before…。“要过多久(不久)……才……”(before从句谓语动词要用一般时态)
it was not long before he sensed the danger of the position.不久他就意识到他处境的危险。
it was five days before he came back. 五天后他才回来。
it will be half a year before you graduate from the school. 再过半年你才能毕业。
it will not be long before they understand each other. 他们大概不久就会互相了解。
in case of…(+n.) “以防;万一”;
in case that…“以防，万一……”(谓语动词用一般现在时态或should+动词原形)
in case of fire， what should we do?
please remind me about it in case i forget/should forget. 万一我忘了，请提醒我。
in case (that) john comes/should come， please tell him to wait.
please take your umbrella in case (that it rains/should rain)。带上雨伞，以防下雨。
强调句的基本构成：it is/was + 被强调的部分 + who(主要指人时)/that + 其余部分
强调时间、地点、原因或方式时不要用when， where或how， 必须用that。
i saw him in the street yesterday afternoon.
→it was i who saw him in the street yesterday afternoon.(强调主语)
→it was in the street that i saw him yesterday afternoon.(强调地点状语)
→it was yesterday afternoon that i saw him in the street.(强调时间状语)
→it was him that/who i saw in the street yesterday afternoon.(强调宾语)
he didn’t go to bed until his mother came back.
→it was not until his mother came back that he went to bed.
he didn‘t do his homework until his father came back from work.
→it wasn’t until his father came back from work that he did his homework.
only when you nearly lose someone do you fully realize how much you value him.
→it is only when you nearly lose someone that you fully realize how much you value him.
i was late again because the traffic was very heavy during the rush hour.
→it was because the traffic was very heavy during the rush hour that i was late again.
(强调句中只能强调由because引导的原因状语从句，because不能换成since， as， for， now that等)
一般疑问句 is / was it +被强调部分 +who / that …?
特殊疑问句 特殊疑问词+is /was +it +who / that…?
what is/was it that…? who is/was it that…? when is/was it that…?
where is/was it that…? why is/was it that…? how is/was it that…?
i saw him in the street yesterday afternoon.
→when was it that you saw him in the street?
→who was it that you saw in the street yesterday afternoon?
→where was it that you saw him yesterday afternoon?
i don‘t know when he will come back.
→i don’t know when it is that he will come back.(宾语从句疑问词后用陈述句语序)
-how was it that you got in touch with mr. smith?你是怎么和smith先生联系上的?
-trough a friend of mine. 通过一个朋友。
(1)、祈使句(表条件)+ or/or else/ otherwise + 主句(表结果)… “否则…，要不然…”
(2)、祈使句(表条件)+ and +主句(表结果)
hurry up， or you‘ll be late for class.
please call me up before you come， otherwise/or else/or we might be out.
think it over and you will find the answer.
give him an inch and he will take a mile. 得寸进尺。
work hard and you will make progress every day. 好好学习，天天向上。
you are to stay until/till your mother comes back. 你得等到你妈妈回来。
the meeting was put off until ten o’clock. 会议推迟到十点钟。
the villagers didn‘t realize how serious the pollution was until all the fish died in the river.
→not until all the fish died in the river did the villagers realize how serious the pollution was.(倒装句)
he didn’t go to bed until his mother came back.
→it was not until his mother came back that he went to bed.(强调句)
not until he failed in the exam did he realize that he had wasted much time playing computer games.
not until his son came back from school did he go to bed.
i shall go tomorrow unless it rains. 如果不下雨，我明天去。
-shall tom go and play football?
-not unless he has finished his homework. 除非他完成作业，否则不能出去。
i won‘t go unless he comes to invite me himself.
i won’t attend his birthday party unless invited (=unless i am invited)。 除非被邀请，否则我不
when除了用来引导主语从句、宾语从句、时间状语从句、表语从句和定语从句，还有一种用法值得关注，那就是when引导并列分句，意思是“这时突然;就在那时”，强调另一个动作的突然发生。常用于以下2016高考英语必考知识点中：(1)、主语 + be doing… when…意思是“正在做某事这时……”;(2)、主语 + be about to do…when…;(3)、主语+be on the point of (doing) …when…意思是“正要去做某事这时……”
one day chuck was on a flight across the pacific ocean when suddenly his plane crashed. 有一天，chuck正在太平洋上飞行，这时他的飞机突然爆炸了。
i don‘t know when he will arrive. 我不晓得他什么时候到达。
i thought of the happy days when i was in beijing. 我想起了在北京时的那段快乐日子。
i believe the time will soon come when there will be no weapons in the world. 我相信世界上没有武器的日子不久就会到来。
i was walking along the river when i heard a drowning boy cry for help. 我正在河边行走，这时我突然听到一个落水男孩求救。
i was about to leave when it began to rain. 我刚要离开，这时下雨了。
i had just finished my exam paper when the bell rang， announcing the class was over. 我刚做完作业，下课铃响了。
i thought of the happy days when i was in france. 我想到了在法国时那段快乐日子。
i believe the time will soon come when there will be no weapons in the world. 我相信世界上没有武器的日子不久就会来临。
i was walking along the street when i caught sight of a tailor’s shop. 我正在街上走，这时我看见一家裁缝店。
i was walking along the streets. just at the moment i caught sight of a tailor‘s shop. 我在街上走。就在那时我看见一家裁缝店。
while除了有“当/在……时候”的意思外(注意：引导的句子谓语动词只能是延续性动词!)，另外的两层意思也是考查的重点：(1)while = although “尽管”、“虽然”，引导让步状语从句;(2)while的意思是“然而;可是”，常用来表达对比关系。
while i admit that the problem is difficult， i don’t think that they can‘t be solved.
while i admit his good points， i can see his shortcomings.
while i was angry with her， i didn’t lose my temper.
while i understand your viewpoint， i don‘t agree with you. 虽然我了解你的见解， 我还是不能同意(你)。
i earn only 120 dollars a week， while she earns 180 dollars. 我一星期只赚120美元，她却赚180美元。
[注意]where引导地点从句时，可以引导定语从句或是逻辑地点状语从句。当它在定语从句中作地点状语，指代地点时，这时可以用in which， on which， at which， to which， from which等结构代替。但是它引导逻辑地点状语从句时，没有这样用法。
you should put the book where it was. 把书放回原处。
persistent people begin their success where others end in failure.
where there is a will， there is a way. 有志者，事竟成。
where men are greedy， there is never peace. 人类贪欲不止，世界和平无望。
go where you should， keep on studying. 无论你到哪里，你都应该继续学习。
that is the building where my father works. 那是我父亲工作的大楼。
yesterday i went to the department store， where i met my teacher. 昨天我去百货公司，就在那儿遇见了我的老师。
that’s where a change is needed. 那就是需要变更的地方。
we could see the runners very well from where we stood. 从我们所站的地方能很清楚地看到赛跑的选手。
you should let your children play where you can see them. 你应该让小孩在你的视线所及的地方玩耍。
potatoes can be grown in places where it is too cold to grow rice.=potatoes can be grown in places where it is too cold to grow rice.(本句where引导定语从句)
potatoes can be grown where it is too cold to grow rice.(本句where引导地点状语从句)
what is the population of the world? 世界的人口有多少?
what did you pay for this picture? 这幅画你付了多少钱?
what is most important in life isn‘t money. 人生最重要的并非是金钱。
will you show me what you bought? 可以把你所买的东西给我看一下吗?
mary is no longer what she was ten years ago. mary已经不是10年前的她了。